How the Stock Market Actually Works (Without the Wall Street Jargon)

What the stock market is

The stock market is a marketplace where people buy and sell pieces of companies. Those pieces are called shares of stock. When you own a share of Apple, you own a microscopically small slice of Apple — its products, its profits, its future.

There are exchanges like the New York Stock Exchange and Nasdaq that match buyers with sellers all day long. When you place an order in your brokerage app, that order gets routed to one of these exchanges, paired with someone selling at your price, and the trade settles. The whole process takes milliseconds.

Why companies go public

Going public means a company sells shares of itself to the public for the first time — an IPO (Initial Public Offering). The company gets a big pile of cash to grow with. In exchange, the original owners now share ownership with thousands of strangers.

Once a company is public, anyone with a brokerage account can buy or sell its shares. The price moves based on what people are willing to pay second by second.

How stock prices move

Three forces drive price:

• Earnings and fundamentals — is the company actually making more money over time?
• Expectations — what investors think will happen next, often more than what's happening now.
• Sentiment — how greedy or fearful the market is feeling in general.

In the short term, sentiment dominates. In the long term, earnings dominate. That's why the market can be irrational for months but is usually right over decades.

Bull markets vs bear markets

A bull market is a sustained period of rising prices (think the long run from 2009 to 2020). A bear market is a drop of 20% or more from the peak (think 2008 or early 2020).

Both are normal. The U.S. stock market has had roughly one bear market per decade since the 1920s. Every single one has eventually been followed by new all-time highs.

Why the stock market always goes up long-term

Over 100+ years, the U.S. stock market has averaged around 10% per year before inflation. Not every year — some years it's up 30%, some years it's down 40% — but averaged over long stretches.

The reason is simple: companies in aggregate keep getting more productive. People keep buying more stuff. Technology keeps improving. Population keeps growing. The whole engine, on average, keeps producing more value.

Why market timing doesn't work

Trying to predict short-term moves is a loser's game. Multiple studies show that missing just the 10 best days in the market over a 20-year period cuts your total return by more than 50%.

Those best days disproportionately happen during or right after the scariest crashes. If you sell when things look bad, you almost certainly miss them. The simplest strategy — buy regularly, hold for decades — beats almost everyone trying to outsmart it.